Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1998ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYSYSTEM SPECIFICATIONSCYLINDER HEAD OVERHAUL SPECIFICATIONSVALVE SPECIFICATIONS
1998 Chevrolet Astro Van 2WD V6-4.3L VIN W
Valve Specifications
1998 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Valve Specifications
Cylinder Head
Surface Flatness 0.10 mm (Maximum) (0.004 inch (Maximum)
Valve Face Angle 45°
Valve Head Edge Margin 0.79 mm (Minimum) (0.031 inch (Minimum)
Valve Lash Net Lash-No Adjustment
Valve Lift (Exhaust) (L35) 10.879 mm (0.4280 inch)
Valve Lift (Exhaust) (LF6) 9.887 mm (0.3890 inch)
Valve Lift (Intake) (L35) 10.527 mm (0.4140 inch)
Valve Lift (Intake) (LF6) 10.215 mm (0.4020 inch)
Valve Lifter Hydraulic Roller
Valve Rocker Arm Ratio 1.5:1
Valve Seat Angle 46°
Valve Seat Runout 0.05 mm (Maximum) (0.002 inch (Maximum)
Valve Seat Width (Exhaust) 1.575 - 2.362 mm (0.065 - 0.098 inch)
Valve Seat Width (Intake) 0.89 - 1.52 mm (0.035 - 0.060 inch)
Valve Spring Free Length 51.3 mm (2.02 inch)
Valve Spring Installed Height
(Exhaust) 42.92 - 43.43 mm (1.670 - 1.700 inch)
Valve Spring Installed Height
(intake) 42.92 - 43.43 mm (1.670 - 1.700 inch)
Valve Spring Pressure
(Closed) 338 - 374 Nm at 43.2 mm (76 - 84 lbs. at 1.70 inch)
Valve Spring Pressure
(Open) 832 - 903 Nm at 32.3 mm (187 - 203 lbs. at 1.27 inch)
Valve Stem Clearance
(Exhaust-Production) 0.025 - 0.069 mm (0.0010 - 0.0027 inch)
Valve Stem Clearance
(Exhaust-Service) 0.025 - 0.094 mm (0.0010 - 0.0037 inch)
Valve Stem Clearance
(intake-Production) 0.025 - 0.069 mm (0.0010 - 0.0027 inch)
Valve Stem Clearance
(Intake-Service) 0.025 - 0.094 mm (0.0010 - 0.0037 inch)
Valve Stem Oil Seal Installed Height
(Measured from the Top of the Large Diameter
Valve Guide Bevel to the Bottom of the
Valve Stem Oil Seal) 1-2 mm (0.03937 - 0.07874 inch)
Surface Flatness 0.10 mm (Maximum) (0.004 inch (Maximum)
Valve Face Angle 45°
Valve Head Edge Margin 0.79 mm (Minimum) (0.031 inch (Minimum)
Valve Lash Net Lash-No Adjustment
Valve Lift (Exhaust) (L35) 10.879 mm (0.4280 inch)
Valve Lift (Exhaust) (LF6) 9.887 mm (0.3890 inch)
Valve Lift (Intake) (L35) 10.527 mm (0.4140 inch)
Valve Lift (Intake) (LF6) 10.215 mm (0.4020 inch)
Valve Lifter Hydraulic Roller
Valve Rocker Arm Ratio 1.5:1
Valve Seat Angle 46°
Valve Seat Runout 0.05 mm (Maximum) (0.002 inch (Maximum)
Valve Seat Width (Exhaust) 1.575 - 2.362 mm (0.065 - 0.098 inch)
Valve Seat Width (Intake) 0.89 - 1.52 mm (0.035 - 0.060 inch)
Valve Spring Free Length 51.3 mm (2.02 inch)
Valve Spring Installed Height
(Exhaust) 42.92 - 43.43 mm (1.670 - 1.700 inch)
Valve Spring Installed Height
(intake) 42.92 - 43.43 mm (1.670 - 1.700 inch)
Valve Spring Pressure
(Closed) 338 - 374 Nm at 43.2 mm (76 - 84 lbs. at 1.70 inch)
Valve Spring Pressure
(Open) 832 - 903 Nm at 32.3 mm (187 - 203 lbs. at 1.27 inch)
Valve Stem Clearance
(Exhaust-Production) 0.025 - 0.069 mm (0.0010 - 0.0027 inch)
Valve Stem Clearance
(Exhaust-Service) 0.025 - 0.094 mm (0.0010 - 0.0037 inch)
Valve Stem Clearance
(intake-Production) 0.025 - 0.069 mm (0.0010 - 0.0027 inch)
Valve Stem Clearance
(Intake-Service) 0.025 - 0.094 mm (0.0010 - 0.0037 inch)
Valve Stem Oil Seal Installed Height
(Measured from the Top of the Large Diameter
Valve Guide Bevel to the Bottom of the
Valve Stem Oil Seal) 1-2 mm (0.03937 - 0.07874 inch)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.